Hazardous Locations & Potentially Explosive AtmospheresGuide to Equipment Certification Requirements
HZL0616
Type of Protection Ex Code
EPL Zone2Basic Concept of
Protection
General Requirements -
0,1, ,2,20 21,22
Intrinsic Safety3
North American Standard
ISA/UL/CSA
60079-0 General requirements for all Ex equipment
ia
ib
ic
Ga Gb Gc
GcDc
0, 20
1, 21
2, 22
60079-11Limit energy of sparks& surface temperature
Increased Safety(ec pending)
eb GbDb
1, 21No arcs, sparks orhot surfaces
Non-Sparking nA Gc 2 60079-15
Flame-Proof
da
db
q
dc
Ga
Gc 2
0
1 60079-1Contain the explosion and extinguish the flamePowder-Filled
Enclosed Break
1 60079-5
nC Gc 2 60079-15
Purge and Pressurization
px
21, 22
py
pz
60079-2
Prevent ingress of explosive atmosphereand limit surfacetemperature
Encapsulation
ma
mb
mc
0, 20
1, 21
GcDc
2, 22
60079-18
Restricted Breathing
Sealed Device
nR
nC
Gc
Gc
2
2
60079-15
Dust-Protected
ta
tb
tc
Da
Dc 22
20
21Db 60079-31
Optical Radiation4
op pr GbDb
0, 20
1, 21
0, 20op is
op sh
GaDa
GaDa
ISA 60079-28
Protection againstrelease of optical energy
Limitation of optical energy
Optical system interlocking
Type of Protection Class Division & Zone
Basic Concept of Protection
General Requirements
Non-Arcing / Non-Incendive
Explosion-Proof
Purge and Pressurization
ISA 12.12.01, CSA No. 213,
FM 3611
Dust-Tight
Dust Ignition-Proof
Intrinsic Safety
Required for all equipment evaluated to FM Standards
Note 1: In the United States, suitability for equipment in mining applications is per approval by the Mine Safety and Health Administration (MSHA). Intertek can test and evaluate equipment to ACRI standards or equivalent, per US National Standards, providing test reports for your submittal to MSHA.
Note 2: For US Zone Ex Scheme: Zone 0, 1 and 2 “Ex” markings are preceded by “Class I,” and “Ex” is preceded by “A.”
Note 3: For associated intrinsically safe apparatus suitable for installation in a hazardous location, the symbol for the type of protection (“ia” or “ib”) is enclosed within square brackets on the marking, e.g., "AEx d [ia] IIC T4." For intrinsically safe apparatus not suitable for installation in a hazardous location, both the symbol “Ex” or “AEx,” and the symbol for the type of protection, “ia” or “ib,” are enclosed within the same square brackets on the marking, e.g., [AEx ia] IIC; in this case, a temperature class is not included.
Note 4: Neither optical protection nor optical radiation is addressed by the NEC® or CEC®.
Protection Concepts [NEC & CEC ]1
Electrical Equipment - Zone "Ex" SchemeDa
Db Dc
GaDa
GbDb
Gb
60079-7
Gb
pD
Gb
Gb
Gc
-
1
1
2
ISA 61241-0 &ISA 61241-2
GbDb
GaDa
Oil Immersion o Gb 1 60079-6
60079-15
tD - 21,22ISA 61241-0 &ISA 61241-1
Type North American Standard
I, II, IIII-
-
-
-
Division 1, 2Zone 0, 1, 2
Zone 20, 21, 22FM 3600
I, IIIIII-
Division 2Division 1, 2
Zone 2Zone 22
Energy Limitation, Non-arcing/sparking, Sealing, and Ingress Protection
Contain the explosion and extinguish the flame
II
Division 1Zone 1
UL 1203, CSA No. 30, FM 3615
I, III
I, III
I, III
Division 1Zone 1
Division 1Zone 1
Division 2Zone 2
X
Y
Z
NFPA 496, FM 3620
Prevent ingress of explosive atmosphere and limit surface temperature
II-
III-
Division 2Zone 22
Division 1, 2Zone 22
- ISA 12.12.01CSA No. 213
II-
Division 1Zone 20, 21
UL 1203, CSA No. 25,FM 3615, FM 3616
Electrical Equipment - Division Scheme and Zone Equivalency
ISA/UL/CSA 60079-11UL 913, CSA No. 157,
FM 3610
III, III
I-
Division 1Division 1
Zone 0Zone 20
Limit energy of sparks andsurface temperature
North America
a
1 Indoor General Purpose
2 Indoor Protection against angled dripping water
3,
3R
3SIndoor / Outdoor
4, 4XIndoor / Outdoor
Protection against rain, snow, hose directed water and corrosion
5 Indoor Protection against angled dripping water, dust, fibers, flyings
6Indoor / Outdoor
Protection against temporary submersion
6PIndoor / Outdoor
Protection against prolonged submersion
12, 12K Indoor Protection against circulating dust, fibers, flyings
13 Indoor Protection against circulating dust, fibers, flyings, seepage
Indoor /Outdoor Protection against rain, sleet, dirt and snow
Protection against rain, sleet, dirt, snow and windblown dust
Other Useful Standards Standard Types
Area Classification - Gases, Vapors and Mists
IEC Standards US & CAN Standards
Area Classification - Combustible Dusts, Fibers, Flyings
Electrical Equipment Installation
Electrical Equipment Inspection and Maintenance
Electrical Equipment Repair and Overhaul
Material Characteristics for Gas and Vapor Classification
Material Characteristics for Dust Classification IEC 60079-20-2 NFPA 499
IEC 60079-10-1
IEC 60079-10-2
IEC 60079-14
IEC 60079-17
IEC 60079-19
IEC 60079-20-1
NFPA 497
NFPA 499
NFPA 70 [NEC®]/CSA C22.1 [CEC®]
NFPA 70B
-
NFPA 497
Application of Quality Systems for Equipment Manufacture ISO/IEC 80079-34 -
Quality Management Systems ISO 9001 ISO 9001
Hazard Level Type of Explosive Atmosphere
Continuous Hazard
Division 1
Zone 0 / Zone 20
Intermittent Hazard
Zone 1 / Zone 21
Hazard Under Abnormal Conditions
Division 2 Zone 2 / Zone 22
Division Scheme
Continually present
Likely to occur during normal operations
Not likely to occur during normal operations, but may occur for short periods
Max. Surface Temperature NEC® 500 / CEC® NEC® 505 / IEC - Group II
1T1T )Fº248( C º054
2T2T)Fº275( C º003
A2T)Fº635( C º082
B2T)Fº005( C º062
C2T)Fº644( C º032
D2T)Fº914( C º512
3T3T)Fº293( C º002
A3T)Fº653( C º081
B3T)Fº923( C º561
C3T)Fº023( C º061
4T4T)Fº572( C º531
A4T)Fº842( C º021
5T5T)Fº212( C º001
6T6T)Fº581( C º58
Note 7: For Group I applications (ATEX and IECEx only), electrical apparatus has fixed temperature limits of 150ºC (where layers of coal dust can form) and 450ºC (where coal dust is not expected to form a layer).
7
North America/ATEX/IECEx
Note 5: Group E is applicable to Class II Division 1 onlyNote 6: Methane is a group IIA Gas for non-mining applications
spuorG enoZspuorG noisiviDssalC drazaHecnatsbuS
Acetylene
Class IFlammable Gases
Group A IIC
IIB + H2B puorGnegordyH
BIIC puorGenelyhtE
AIID puorGenaporP
AIID puorGenahteM
Combustible Metal Dusts
Class IICombustible Dusts
Group E IIIC
BIIIF puorGstsuD suoecanobraC elbitsubmoC
Combustible Dusts not in Group E or F (Flour, Grain, Wood, Plastics, Chemicals) Group G IIIB
Combustible Fibers and FlyingsClass III
Fibers and FlyingsNot Applicable IIIA
5
6
Functional Safety [IEC 61508 Safety Systems]11
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General Requirements
Note 11: The IEC/EN 61508 series of standards sets out the requirements for electrical, electronic, and programmable safety-related systems, covering the design, implementation, operation, and maintenance as necessary for the assigned Safety Integrity Level (SIL).
According to the system application, four SILs are de�ned and assigned to the system. The standard is also the basis for ATEX-related safety devices, EN 50495.
IEC/EN 61508-1
IEC/EN 61508-2
IEC/EN 61508-3
IEC/EN 61508-4
IEC/EN 61508-5
IEC/EN 61508-6
IEC/EN 61508-7
Standard # Title/Scope
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 2: Requirements for electrical/electronic/programmable electronic safety-related items
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software Requirements
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and Abbreviations
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 5: Examples of methods for the determinationof safety integrity levels
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 6: Guidelines on the application of IEC 61508-2and IEC 61508-3
Functional Safety of electrical/electronic/programmable electronic safety-related systems - Part 7: Overview of techniques and measures
13
[IEC 60529]First Number (protect from solid bodies)
Second Number (protect from water)
0 No Protection 0 No Protection
1 Objects > 50mm 1 Vertical drip
2 Objects > 12.5mm 2 Angled drip
3 Objects > 2.5mm 3 Spraying
4 Objects > 1.0mm 4 Splashing
5 Dust-Protected 5 Jetting
6 Dust-Tight 6 Powerful jetting
7 Temporary immersion
8 Continuous immersion
Group Environment Location Typical Substance
I
Gases, Vapors and
Mists
Coal Mining
Methane (Firedamp)
IIA
Surface and
Other Locations
Methane, Propane, etc.
enelyhtEBII
IICHydrogen,
Acetylene, etc.
IIIA
Combustible Dusts
Combustible Flyings
Conductive-noNBIII
IIIC Conductive
High pressure and temperature water jet
9
Equipment GroupATEX
Equipment Category
AtmosphereEquipmentProtection Level (EPL)
Required Protection Performance & Operation
I (Mines with Firedamp) M1 Methane & Dust Very High Ma
Two faults, Remain energized and functioning
I (Mines with Firedamp) M2 Methane & Dust High Mb
Severe normal operation, De-energize in exp. atm.
II (All Other Areas) 1G, 1D Gas, Vapor, Mist, Dust Very High Two faults
II (All Other areas) 2G, 2D Gas, Vapor, Mist, Dust High One fault
II (All Other Areas) 3G, 3D Gas, Vapor, Mist, Dust Low Normal operation
Note 13: Refer to IEC 60034-5 for Ingress Protection of rotating electrical machines
Type of Protection Ex Code
EPL Zone(s)Basic Concept of
Protection
Electrical Equipment
General Requirements -
All12 0,1, ,2,20 21,22
Intrinsic Safety
Non-Electrical Equipment
IEC/ENStandard
60079-0 General requirements for all Ex equipment
ia
ib
ic
GaDaMaGbDbMb
GcDc
0, 20
1, 21
2, 22
60079-11Limit energy of sparks& surface temperature
Increased Safety
eb
ec
GbDbMb
GcDc
1, 21
2, 22
60079-7 No arcs, sparks orhot surfaces
Non-Arcing nA Gc 2 60079-15
Flame-Proof
da
db
q
dc
GbMb
Ga
Gc 2
0
1 60079-1Contain the explosion and extinquish the flamePowder-Filled
Enclosed Break
GbMb 1 60079-5
Sealed Device
nC
nC
Gc
Gc
2
2
60079-15
60079-15
Purge and Pressurization
pxb
2, 22
1, 21
1, 21pyc
pzc
GbDbMbGbDbGcDc
60079-2
Prevent ingress of explosive atmosphereand limit surfacetemperature
Encapsulation
ma
mb
mc
GaDaMaGbDbMb
0, 20
1, 21
GcDc 2, 22
60079-18
Restricted Breathing
Liquid Immersion
nR
ob
Gc
Gb
2
2
60079-15
60079-6
Dust-Protected
ta
tbtc
Da
Dc 22
20
21Db 60079-31
Optical Radiation
op pr GbDb
0, 20
1, 21
0, 20op is
op sh
GaDaGaDa
60079-28
Protection againstrelease of optical energy
Limitation of optical energy
Optical system interlocking
Type of Protection IECEx Code/ATEX Code EPL ZoneISO/IEC
Standard(IECEx)
Basic Concept of Protection
EN Standard(ATEX)
80079-36 13463-1 Basic methods &requirementsAll12General Requirements
13463-2 Relies on tight seals,closely machinedjoints, and tough enclosures to restrictthe breathing of theenclosure
Flow-Restricted Enclosure
13463-3All12Flame-Proof Enclosure
80079-37 13463-5AllConstructional Safety
GcDc 2, 22 -
-1, 21
Control of Ignition Sources
Liquid Immersion
Purge & Pressurization
Ignition Hazards & Risk Assessment
p
-
All
All
GbGc
DbDc
0,1,2,20,21,22
0,1,2,20,21,22
0,1,2,20,21,22
0,1,2,20,21,22
1, 2, 21, 22
0,1,2,20,21,22All
80079-37
80079-37
60079-2
80079-36
13463-6
13463-8
1127-1
60079-2
Ignition hazardsmitigated by goodengineering methods
Control equipmentfitted to detectmalfunctionsEnclosure uses liquid to prevent contact with explosive atmospheresPrevent ingress of explosive atmosphere &limit surface temp.
Basic concepts and methodology, & ignitionhazard assessment
Note 12: Evaluation per EN 50303 is additionally required for ATEX, Category M1
Liquid Immersion oc Gc 60079-6
1
h
-
-
fr
-
d
ch
c
bh
bkh
k
Division Scheme Zone Scheme (Gas)
Zone Equivalency Scheme Zone Scheme (Dust)
Class I Division 1 Groups A,B,C,D T4
HazardClass
AreaClassification
GasGroup
TemperatureClass
Class I Zone 0 Groups IIA,IIB,IIC T4
HazardClass
AreaClassification
GasGroup
TemperatureClass
Class I Zone 0 ia Ga
HazardClass
AreaClassification
GasGroup
TemperatureClass
AEx IIC T4
Ex ProtectionScheme
ProtectionConcept Code
EquipmentProtectionLevel (EPL)
Zone 20 ta Da
AreaClassification
DustGroup
SurfaceTemperature
AEx IIIC T90 C
Ex ProtectionScheme
ProtectionConcept Code
EquipmentProtectionLevel (EPL)
Items in Orange are US Only. For Canada any new installations must be classi�ed using the Zone system, while existing installations may either use Division or be re-classi�ed to Zone. US installations may use either Division or Zone.
Typical North American Marking
IECEx Scheme (Additional Market Access)Manufacturers of Ex equipment can obtain certificates of conformity, accepted at a national level for all countries participating in the IECEx Scheme.
A certificate of conformity may be obtained from any certification body accepted into the Scheme. The certificate will attest (1) the equipment design conforms to relevent IEC Standards, and (2) the product is manufactured under a quality control program assessed and registered though a Quality Assessment Report (QAR) by an accredited IECEx Certification Body (ExCB).
On March 31, 2015, the United States Coast Guard (USCG) published final rule 80 FR 16980, applicable to Mobile Offshore Drilling Units (MODU), floating Outer Continental Shelf (OCS) facilities, and vessels, other than offshore supply vessels regulated under 46 CFR Subchapter L, constructed after April 2, 2018, that engage in OCS activities. The rule implication is that any equipment installed after April 2, 2018, on rigs, MODUs or OSVs in the U.S. Outer Continental Shelf must be certified or listed in accordance with either National Regulations by an approved agency (e.g., a third-party certification body), or the IECEx Scheme. The USCG does NOT permit the use of equipment certified solely under the ATEX Directive.
Intertek has IECEx Testing Laboratories (ExTLs) in the US, UK, Italy and India and is an IECEx Certification Body (ExCB) in the US and the UK. For more information contact [email protected], or visit www.IECEx.com.
ATEX and IECEx
Other CE Directives That May Apply8
Electromagnetic Compatibility (EMC)
Low Voltage9
Machinery Directive
Medical Devices Directive
Pressure Equipment Directive (PED)
Radio Equipment Directive (RED)
Restriction of Hazardous Substances (RoHS)
Note 8: Intertek is a provider of evaluation and certi�cation to these directives and their Harmonized Standards, where applicableNote 9: Excludes equipment for use in explosive atmospheres - see ATEX Annex II 1.2.7
2014/30/EU
2014/35/EU
2006/42/EC
93/42/EEC
97/23/EC
2014/53/EU
2002/95/EC
ATEX Directive (Additional Market Access)Intertek can now issue ATEX Notified Body certificates out of the US - in addition to capabilities from the UK - speeding time to market for North American manufacturers. For more information contact [email protected].
ATEX Category
Equipment Protection
Level
Typical Equipment Zone Suitability
1 G Ga Zones 0, 1, 2
1 D Da
2 G Gb
2 D Db
3 G Gc
3 D Dc
Equipment Category ATEX
2014/34/EU
Zone of Use
Gas, Vapors,& Mist
Dust
Category 1 Zone 0, 1 & 2 Zone 20, 21 & 22
Category 2 Zone 1 & 2 Zone 21 & 22
Category 3 Zone 2 Zone 22
1010
M1
M2
Ma
Mb
Zones 20, 21, 22
Zones 1, 2
Zones 21, 22
Zone 2
Zone 22
Very high level of protection for mines
High level of protection for mines
Note 10: Unless the explosion protection risk assessment states otherwise
0359
Complies with European
Directive*
Notified Body
Number*
AtmosphereGroup
TemperatureClass
ExplosionProtection
ProtectionType
EquipmentProtectionLevel (EPL)
II
Equipment Group*
Ex db IIC T4 Gb
SpecificMarking for
ExplosionProtection*
Equipment Category*
2
Environment*
G
*ATEX only (ATEX 2014/34/EU)
Typical ATEX & IECEx Marking
noitinifeD feirB erAepTy
Enclosure Type Ratings [NEC & CEC ]® ®
Equipment Categories &Protection Levels
ATEX Categories vs Zonesof Use
Temperature Classification
Classification of Divisions and Zones
Atmosphere Groups
Protection Concepts [ATEX and IECEx]
Ingress Protection Codes Atmosphere Groups[ATEX & IECEx]
Equipment Groups [ATEX]
® ®
-
-
Zone SchemeGas/Dust
FUNCTIONAL SAFE
TY
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